角度是两个相交线或表面之间旋转的度量。它以程度（°）或弧度（rad）为单位进行测量。
1 FC = 6.283 rad
1 rad = 0.159 FC
例子:
将15 完整的圆圈转换为弧度：
15 FC = 94.248 rad
| 完整的圆圈 | 弧度 |
|---|---|
| 0.01 FC | 0.063 rad |
| 0.1 FC | 0.628 rad |
| 1 FC | 6.283 rad |
| 2 FC | 12.566 rad |
| 3 FC | 18.85 rad |
| 5 FC | 31.416 rad |
| 10 FC | 62.832 rad |
| 20 FC | 125.664 rad |
| 30 FC | 188.495 rad |
| 40 FC | 251.327 rad |
| 50 FC | 314.159 rad |
| 60 FC | 376.991 rad |
| 70 FC | 439.823 rad |
| 80 FC | 502.655 rad |
| 90 FC | 565.486 rad |
| 100 FC | 628.318 rad |
| 250 FC | 1,570.796 rad |
| 500 FC | 3,141.592 rad |
| 750 FC | 4,712.387 rad |
| 1000 FC | 6,283.183 rad |
| 10000 FC | 62,831.831 rad |
| 100000 FC | 628,318.306 rad |
规则